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- /* systime.h - System-dependent definitions for time manipulations.
- Copyright (C) 1993 Free Software Foundation, Inc.
-
- This file is part of GNU Emacs.
-
- GNU Emacs is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 1, or (at your option)
- any later version.
-
- GNU Emacs is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNU Emacs; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #ifdef TIME_WITH_SYS_TIME
- #include <sys/time.h>
- #include <time.h>
- #else
- #ifdef HAVE_SYS_TIME_H
- #include <sys/time.h>
- #else
- #include <time.h>
- #endif
- #endif
-
- #ifdef HAVE_TZNAME
- #ifndef tzname /* For SGI. */
- extern char *tzname[]; /* RS6000 and others want it this way. */
- #endif
- #endif
-
- /* SVr4 doesn't actually declare this in its #include files. */
- #ifdef USG5_4
- extern long timezone;
- #endif
-
- #ifdef VMS
- #ifdef VAXC
- #include "vmstime.h"
- #endif
- #endif
-
-
- /* EMACS_TIME is the type to use to represent temporal intervals -
- struct timeval on some systems, int on others. It can be passed as
- the timeout argument to the select system call.
-
- EMACS_SECS (TIME) is an rvalue for the seconds component of TIME.
- EMACS_SET_SECS (TIME, SECONDS) sets that to SECONDS.
-
- EMACS_HAS_USECS is defined iff EMACS_TIME has a usecs component.
- EMACS_USECS (TIME) is an rvalue for the microseconds component of TIME.
- This returns zero if EMACS_TIME doesn't have a microseconds component.
- EMACS_SET_USECS (TIME, MICROSECONDS) sets that to MICROSECONDS.
- This does nothing if EMACS_TIME doesn't have a microseconds component.
-
- EMACS_SET_SECS_USECS (TIME, SECS, USECS) sets both components of TIME.
-
- EMACS_GET_TIME (TIME) stores the current system time in TIME, which
- should be an lvalue.
- EMACS_SET_UTIMES (PATH, ATIME, MTIME) changes the last-access and
- last-modification times of the file named PATH to ATIME and
- MTIME, which are EMACS_TIMEs.
-
- EMACS_ADD_TIME (DEST, SRC1, SRC2) adds SRC1 to SRC2 and stores the
- result in DEST. SRC should not be negative.
-
- EMACS_SUB_TIME (DEST, SRC1, SRC2) subtracts SRC2 from SRC1 and
- stores the result in DEST. SRC should not be negative.
- EMACS_TIME_NEG_P (TIME) is true iff TIME is negative.
-
- */
-
- #ifdef HAVE_TIMEVAL
-
- #define EMACS_HAS_USECS
-
- #define EMACS_TIME struct timeval
- #define EMACS_SECS(time) ((time).tv_sec + 0)
- #define EMACS_USECS(time) ((time).tv_usec + 0)
- #define EMACS_SET_SECS(time, seconds) ((time).tv_sec = (seconds))
- #define EMACS_SET_USECS(time, microseconds) ((time).tv_usec = (microseconds))
-
- #define EMACS_GET_TIME(time) \
- { \
- struct timezone dummy; \
- gettimeofday (&(time), &dummy); \
- }
-
- #define EMACS_ADD_TIME(dest, src1, src2) \
- { \
- (dest).tv_sec = (src1).tv_sec + (src2).tv_sec; \
- (dest).tv_usec = (src1).tv_usec + (src2).tv_usec; \
- if ((dest).tv_usec > 1000000) \
- (dest).tv_usec -= 1000000, (dest).tv_sec++; \
- }
-
- #define EMACS_SUB_TIME(dest, src1, src2) \
- { \
- (dest).tv_sec = (src1).tv_sec - (src2).tv_sec; \
- (dest).tv_usec = (src1).tv_usec - (src2).tv_usec; \
- if ((dest).tv_usec < 0) \
- (dest).tv_usec += 1000000, (dest).tv_sec--; \
- }
-
- #define EMACS_TIME_NEG_P(time) \
- ((time).tv_sec < 0 \
- || ((time).tv_sec == 0 \
- && (time).tv_usec < 0))
-
- #else /* ! defined (HAVE_TIMEVAL) */
-
- #define EMACS_TIME int
- #define EMACS_SECS(time) (time)
- #define EMACS_USECS(time) 0
- #define EMACS_SET_SECS(time, seconds) ((time) = (seconds))
- #define EMACS_SET_USECS(time, usecs) 0
-
- #define EMACS_GET_TIME(t) ((t) = time ((long *) 0))
- #define EMACS_ADD_TIME(dest, src1, src2) ((dest) = (src1) + (src2))
- #define EMACS_SUB_TIME(dest, src1, src2) ((dest) = (src1) - (src2))
- #define EMACS_TIME_NEG_P(t) ((t) < 0)
-
- #endif /* ! defined (HAVE_TIMEVAL) */
-
- #define EMACS_SET_SECS_USECS(time, secs, usecs) \
- (EMACS_SET_SECS (time, secs), EMACS_SET_USECS (time, usecs))
-
- #ifdef USE_UTIME
-
- #define EMACS_SET_UTIMES(path, atime, mtime) \
- { \
- time_t tv[2]; \
- tv[0] = EMACS_SECS (atime); \
- tv[1] = EMACS_SECS (mtime); \
- utime ((path), tv); \
- }
-
- #else /* ! defined (USE_UTIME) */
-
- #define EMACS_SET_UTIMES(path, atime, mtime) \
- { \
- EMACS_TIME tv[2]; \
- tv[0] = atime; \
- tv[1] = mtime; \
- utimes ((path), tv); \
- }
-
- #endif /* ! defined (USE_UTIME) */
-